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What is the primary characteristic that distinguishes Proof-of-Stake (PoS) from Proof-of-Work (PoW) as a consensus mechanism?

PoS requires validators to solve complex mathematical puzzles, while PoW does not. In PoS, validator selection is based on the amount of cryptocurrency a participant holds and is willing to 'stake' as collateral, whereas PoW relies on computational power. PoS blockchains are inherently more centralized than PoW blockchains. Only PoW blockchains are vulnerable to 51% attacks.

Correct Answer:

In PoS, validator selection is based on the amount of cryptocurrency a participant holds and is willing to 'stake' as collateral, whereas PoW relies on computational power.

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